package com.example.config;


import com.example.filter.JwtAuthenticationTokenFiler;
import com.example.handler.AccessDeniedHandelImpl;
import com.example.handler.AuthenticationEntryPointImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.config.annotation.authentication.configuration.AuthenticationConfiguration;
import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;

@Configuration
@EnableGlobalMethodSecurity(prePostEnabled = true )
public class SecurityConfig{

    @Autowired
    private JwtAuthenticationTokenFiler jwtAuthenticationTokenFiler;

    @Autowired
    private AuthenticationEntryPointImpl authenticationEntryPoint;

    @Autowired
    private AccessDeniedHandelImpl accessDeniedHandel;

    @Bean
    public PasswordEncoder passwordEncoder(){
        return new BCryptPasswordEncoder();
    }


    @Bean
    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
        http
                //关闭csrf
                .csrf().disable()
                //不通过Session获取SecurityContext
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                .and()
                .authorizeRequests()
                // 对于登录接口 允许匿名访问
                .antMatchers("/user/login").anonymous() //只有未登录的才可以访问
                .antMatchers("/demo/hello").permitAll() //不管登录没登录都可以访问
//                .antMatchers("/demo/hello").hasAuthority("admin")
                // 除上面外的所有请求全部需要鉴权认证
                .anyRequest().authenticated();//其余请求都得登录
        //把jwt 过滤器 放在user过滤器之前
        http.addFilterBefore(jwtAuthenticationTokenFiler, UsernamePasswordAuthenticationFilter.class);
        //告诉security如何处理异常
        http.exceptionHandling().authenticationEntryPoint(authenticationEntryPoint).accessDeniedHandler(accessDeniedHandel);
        //允许跨域
        http.cors();

        return http.build();
    }

    @Autowired
    private AuthenticationConfiguration authenticationConfiguration;

    @Bean
    public AuthenticationManager authenticationManager() throws Exception{
        AuthenticationManager authenticationManager = authenticationConfiguration.getAuthenticationManager();
        return authenticationManager;
    }

}